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Distressed Residential Mortgage Loans - Geographic Concentrations of Credit Risk (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 13.50% | 3.90%
New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 23.90% | 24.10%
South Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.60% | 7.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Florida |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 11.20% | 11.20%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | North Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 8.50% | 8.30%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | California |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.90% | 6.90%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Georgia |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 6.00% | 5.80%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | New York |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.90% | 5.70%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | South Carolina |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.30% | 5.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Ohio |  |
Concentration Risk [Line Items] |  |
Geographic concentration, percent | 5.00% | 5.10%

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